Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

A quirky and charming restaurant founded by artists.

Meant to be one of the most extravagant hotels in the world, now an eerie, abandoned architectural gem in Mexico City.

The only castle in North America to ever house European sovereigns.

The famous artist couple lived and worked here, in two different houses separated by a bridge.

Diego Rivera's massive tiled fountain and failed infrastructure project.

A jaw-dropping "megalibrary" that turns book-browsing into a geometric adventure.

66,000 pieces of art, donated by one of the world's richest men.

Part bookstore, part café, and part forest.

Superstitious? Discover the witchy side of Mexico through its largest esoteric market.

Frida Kahlo's childhood home, now a museum of her life and works.

An island filled with hundreds of hanging, decomposing, decapitated dolls.

A site where “the ravages of the war are more striking…than any other place in contemporary Spain.”

Natural stone arches form a walkable "cathedral" at low tide, then disappear entirely when the water returns.

A landscape decorated with enormous skull sculptures.